Lemon Buttermilk Chess Pie

1.5 c sugar
3 T flour
3 eggs
1 c buttermilk
1/2 c melted butter
1 T lemon zest
1 t vanilla
3 T lemon juice

Mix filling ingredients and pour into pie crust that has been par cooked for 10 minutes in shallow
glass pie pan.  

320 degrees 55 minutes in gas oven/ glass pan.  Adjust up to 350 degrees accordingly.